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Service Guide ML390/391
Chapter A Board Diagrams
A.2.09 RS232-C Serial Interface (LXHI)
Function
This board permits the serial transport of data to and from the printer. It is capable of transferring data at
speeds up to 19.2 K Baud. Interface parameters (such as baud rate and word length) are selected through
the printer menu.
Firmware
ROM
Version 1 Q8: 1 megabyte ROM. Contains the serial interface control program.
Version 2 None
RAM
Versions 1 and 2 8 kilobytes, Static RAM Receive Buffer
Processor
Version 1 Q3 M80C31F
Version 2 Q3 M80C51F
Fuses
NONE
Jumpers
Version 1 SP1 Side A Q8 has ROM installed
Version 2 SP1 Side B CPU Masked ROM is utilized
Sensors
NONE
Switches
NONE
Test Points
NONE
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